CATH Documentation

This motif comprises a beta strand-loop-helix-loop-strand arrangment,
with the strands lying parallel and hydrogen-bonded to the helix. The
alpha helix packs against the beta strands and thus buries the hydrophobic
side chains in these strands. The
joining loops regions in the motif can vary in length from one residue to more
than 100 residues. 99% of these motifs are right handed.